• Proceedings of the Korea Society of Poultry Science Conference
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• 2003.05a
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• pp.49-59
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• 2003

Heat stress환경의 육용종계에서 사료에 첨가한 비타민 C(200 mg/kg)와 비타민 E(250 mg/kg)가 난각 품질 및 경골 강도에 미치는 영향을 확인하고자 실험을 실시하였다. 강제 환우에서 회복된 83주령의 Ross품종 육용종계 160수를 4처리 4반복 10수씩 개별 케이지에 수용 한 뒤, 10일간의 적응 기간을 둔 뒤, 3주간에 걸쳐 32$^{\circ}C$에서 지속적으로 온도를 유지하면서 사료 섭취량, 산란율, 폐사율, 난중, Haugh unit, 난각의 품질, 경골 파괴강도 그리고 혈액 중의 혈구 세포 등을 조사하였다. Heat stress는 폐사율, 산란율, 난중, 그리고 Haugh unit를 감소시키는 경향이 있었으나 통계적으로 유의하지는 않았다. 난각의 SWUSA와 압축 파괴강도는 비타민 C/E 첨가구에서 2, 3주차에 무첨가구보다 유의하게 높았으나 (P<0.05), 비타 C 또는 E 첨가구 사이에서는 유의차가 없었다. Heterophil과 lymphocyte의 숫자는 heat stress 동안에 각각 증가 또는 감소하였다. 처리구간에는 비타민 C/E 첨가구가 H/L/ratio 수준이 가장 낮았으며, 무첨가구가 가장 높은 경향을 나타내었다. 경골의 파괴강도는 비타민 C 첨가구에서 가장 높았다(P<0.05). 혈액 중의 비타민 C 농도는 비타민 C첨가구와 비타민 C/E 첨가구에서 각각 12.73 g/ml과 8.23 g/ml으로 높았다(P<0.05). 비타민 E 첨가구와 비타민 C/E 첨가구에서 혈액 중 비타민 E 농도가 유의하게 높았다 (P<0.05). Corticosterone 농도는 무첨가구에서 5.97g/ml으로 통계적으로 유의하게 높았다.(P<0.05).

• KSBB Journal
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• v.15 no.4
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• pp.359-365
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• 2000

Three lactic acid bacteria (C-1 K-3 and T-1 strain) were isolated from Nuruk and characterized subsequently. They were useful strains for production of lactic acid and their growth was inhibited at 10% ethanol pH 4 These strains were identified as lactococcus lactis subsp. lactis NR C-1 Leuconostoc mesenteroides subsp. mesenterides NR K-3 and pediococcus pentosaceus NR T-1 respectively by morphological physiological and biochemical characterization Lac lactis subsp lactis NR C-1 showed the highest lactic acid productivity. Leu measenteroides subsp mesenteroides NR K-3 showed stable lactic acid productivity and its growth was inhibited at pH 4. P pentosaceus NR T-1 had lower lactic acid productivity than the other two bacteria but it could not grow at 10% ethanol pH 4 The lactic acid productivity of these three strains in MRS broth were higher than that in Skim milk media the optimum pH and temperature for the lactic acid production of the three strains were 30-32$^{\circ}C$ and pH 6.0∼6.8 Glucose was the optimal carbon souorce for the lactic acid production. In terms of antagonism lac lactis subsp lactis NR c-1 showed somewhat inhibitory efects against some Gram positive rod and cocci such as Lactobacillus brevis and Streptococcus mitis. And Leu mesenteroides subsp mesenteroides NR K-3 showed the inhibitory effects against Streptococcus mitis but P. pentosaceus NR T-1 didn't show any inhibitory effects against tested strains.

• 한국신재생에너지학회:학술대회논문집
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• 2011.05a
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• pp.128.2-128.2
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• 2011

스테인레스 스틸 유연기판 위에 플라즈마 화학기상 증착법 (plasma enhanced chemical vapor deposition)을 이용하여 nip 구조의 미세결정질 실리콘 박막 태양전지 (microcrystalline silicon thin film solar cell)를 제조하고 i ${\mu}c$-Si:H광 흡수층과 p ${\mu}c$-Si:H 사이에 i a-Si:H 버퍼 층을 삽입하여 i/p 계면특성을 개선하고 이에 따른 태양전지 성능특성 변화를 조사하였다. ${\mu}c$-Si:H 박막으로 이루어진 i/p 계면에서의 구조적, 전기적 결함은 태양전지 내에서 생성된 캐리어의 재결합과 shunt resistance 감소를 초래하여 개방전압 (open circuit voltage) 및 곡선 인자 (fill factor)를 감소시키는 것으로 알려졌다. 제조된 미세결정질 실리콘 박막 태양전지는 SUS/Ag/ZnO:Al/n ${\mu}c$-Si:H/i ${\mu}c$-Si:H/p ${\mu}c$-Si:H 구조로 제작되었으며 i/p 계면 사이의 i a-Si;H 버퍼층 두께를 변화시키고 이에 따른 태양전지의 특성을 조사하였다. 태양전지의 구조적, 전기적 특성 변화는 Scanning Electron Microscope (SEM), UV-visible-nIR spectrometry, Photo IV와 Dark IV를 통하여 조사하였다.

• Applied Biological Chemistry
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• v.15 no.3
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• pp.207-211
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• 1972

In order to investigate the action of thermophilic fungi on the xylan and its related substances, xylanase and laminaranase were examined using Myriococcum albomyces. In the extract from bran culture of Myriococcum albomyces, xylanase and laminaranase activity were recognized. 1) The optimum pH for xylanase and laminaranase activity were found to be pH 5.0 and pH 6.0. 2) The optimum temperature for xylanase and laminaranase activity were found to be $55^{\cicr}C$. 3) Thermal stability of xylanase for 55 minutes at $65^{\cicr}C$ and laminaranase for 60 minutes at $65^{\cicr}C$ did not influence their stability.

• Journal of the Korean Society of Food Science and Nutrition
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• v.30 no.6
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• pp.1041-1046
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• 2001

Solutions of fructose, glucose and sucrose were heated without catalyst at various temperature for different length of time. Changes in the formation of early caramelization product and browning intensity as well as pH of heated sugar solutions were determined. Reducing powers of caramelization products (CP) and their inhibitory effects on polyphenol oxidase (PPO) were also determined and their correlations were discussed. The early CP and browning intensity increased with temperature and time, in the order of heated fructose>sucrose>glucose solutions (p<0.005), while pH decreased. pHs of sugar solutions heated at 20$0^{\circ}C$ showed in the range of 3.32 ~ 3.50. Reducing power of CP as well as their inhibitory effect on PPO also increased with temperature and time, respectively. Among sugar solutions, reducing power showed the same trends as above at both 15$0^{\circ}C$ and 17$0^{\circ}C$ (p<0.001). However, those of heated fructose solutions were the highest in the early stage, while those of heated sucrose solutions were the highest in the final stage at 20$0^{\circ}C$. This is due to the difference in CP formed. Sucrose solution heated at 20$0^{\circ}C$ showed the highest inhibitory effect, reducing PPO activity by 34.6%. From these results, it is considered that the inhibitory effect of CP on PPO is partly related to their reducing power.

• Microbiology and Biotechnology Letters
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• v.20 no.6
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• pp.647-654
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• 1992

In order to study the physiological properties of the intestinal bacteria, we isolated the intestinal bacteria of Koreans and tested the enzymatic patterns. Isolated Bifidobacterium sp. Int-57 had the higher activity of $\alpha$-glucosidase, $\beta$-glucosidase, $\alpha$-galactosidase, $\beta$-galactosidase. $\beta$-xylosidase and $\alpha$-arabinofuranosidase than other intestinal microorganisms. The effect of the carbon sources on the production of each enzymes of Bijidobacterium sp. Int-57 was investigated. The most suitable carbon source for the production of $\beta$-glucosidase was maltose, for a-glucosidase cellobiose, for $\alpha$-galactosidase raffinose, for $\beta$-galactosidase lactose, and for $\beta$-xylosidase and $\alpha$-arabinofuranosidase xylose, respectively. In addition, we investigated the optimal conditions and pH stability of each crude enzymes. The optimal condition of a-glucosidase was pH 6.0 and $40^{\circ}C$. that of Jj-glucosidase pH 7.0 and 50oe, that of $\beta$-galactosidase pH 7.0 and $50^{\circ}C$, that of $\beta$-xylosidase pH 6.0 and $40^{\circ}C$ , and that of $\alpha$-arabinofuranosidase pH 5.0 and $50^{\circ}C$. respectively. a-Glucosidase was stable at pH 4.0-9.0. Jj-glucosidase at pH 4.0-7.0. $\beta$-galactosidase at pH 4.0-9.0, $\beta$-xylosidase at pH 4.0-6.0, and /3-arabinofuranosidase at pH 7.0-9.0, respectively.

• Applied Biological Chemistry
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• v.12
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• pp.25-31
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• 1969

The characteristics of crude enzyme produced from Trichoderma viride($O_2-1$) which isolated from half spoiled Locust acacia wood (Robinia Pseudacacia Linne) were examined in this paper. The results obtained were summarized as follows: 1) As a results of enzymatic action on several cellulose substrate it was found that there were some sorts of cellulase in crude enzyme. 2) The activity of C.M.C. ase and ${\beta}-glucosidase$ were decreased in accordance with increasing concentration of substrate, and filter paper saccharifying enzyme relatively increased in accordance with increasing concentration of substrate and enzyme in couse of time. 3) The optimal pH of each enzyme was 5.0 and the range of stability on pH generally from 3 to 6. 4) In disintegrating activity on filter paper, in decomposing activity on C.M.C. and $p-nitrophenyl-{\beta}-D-glucoside$, and in saccharifying activity on filter paper, the optimal temperatures were $50^{\circ}C.,\;60^{\circ}C,\;and\;65^{\circ}C$. 5) The order of stability on temperature was as follow; saccharifying activity on filter paper decomposing activity on C.M.C. disintegrating activity on filter paper>decomposing activity on $p-nitrophenyl-{\beta}-D-glucoside$. 6) The activity of the enzymes was inhibited with mercuric and silver ion, and activated with potassium.

• Asian Pacific Journal of Cancer Prevention
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• v.13 no.1
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• pp.111-115
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• 2012

Variants of X-ray repair cross-complementing group 1 (XRCC1) are involved in the development of cancer, but studies investigating the association of XRCC1-77T>C polymorphism with cancer risk have reported conflicting results. To clarify the effect of the XRCC1 -77T>C polymorphism on cancer risk, we performed a meta-analysis by conducting searches of the published literature in PubMed, Embase and CBM databases. Finally, 13 studies were included into our meta-analysis, involving a total of 11, 678 individuals. Subgroup analyses were performed by ethnicity and cancer type. The results of this meta-analysis showed that there was significant association between the C variant of XRCC1-77T>C polymorphism and cancer risk in all four genetic comparison models (ORC vs. T =1.19, 95%CI 1.07-1.31, P = 0.001; OR homozygote model =1.28, 95%CI 1.07-1.52, P = 0.007; OR recessive genetic model =1.22, 95%CI 1.04-1.44, P = 0.015; OR dominant model =1.21, 95% CI 1.07-1.35, P = 0.001). In the subgroup analyses based on ethnicity, the association was still significant in the Asian population (all p values<0.001), but not in the Caucasian population (all p values > 0.05). Thus, the XRCC1 -77T>C polymorphism is associated with cancer risk, and individuals with XRCC1 -77C variant have a significantly higher cancer risk, particularly in the Asian population.

• Proceedings of the Korea Concrete Institute Conference
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• 1992.10a
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• pp.140-154
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• 1992

The objective of the research stated here was aimed at providing the information needed to establish the Korean Seismic Design Code Recommendations and Guides for precast concrete (P.C) large panel apartment buildings. This was accomplished by investigation and analysis of the response of P.C large panel structures subjected to shaking table excitation simulating earthquake ground motion. one of the test specimens used was 1/3-scaled 3-story box P.C model provided by Sam-Hwan Camus Corporation. The 4m $\times$4m shaking table was used to simulate the earthquake ground motion. the employed input accelerogram was the one recorded as Taft N21E component and the peak ground acceleration(PGA) was scaled depending on the desired level of seismic severity and the time according to dynamic similitude rule. Based on results obtained from shaking table test of this P.C model, the following conclusions were drawn . (1) As far as test specimen is concerned, the seismic safety factors turns out to be 7~8. (2)P.C model has damping ratio of about8% which is twice larger than in-situ R.C. structure. And (3)this model has global displacement ductility ratio of 2~3 through the energy dissipation by opening and sliding of joints.

• Journal of Chest Surgery
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• v.17 no.4
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• pp.657-665
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• 1984

Thirty-seven patients had undergone repair of a endocardial cushion defect between 1977 and Aug. 1983 in Seoul National University Hospital. Twenty eight had a partial defect, one intermediate defect and eight complete endocardial cushion defect. Tricuspid cleft was found in 4 cases and mitral cleft was in all p-ECD. Seven patients were of type C anatomy in c-ECD. Four patients had associated major anomalies, including three TOF in c-ECD, one coarctation in p- ECD. In p-ECD patients, the septal defect was closed with patch in all cases and the atrioventricular valvular insufficiency was corrected with MVR in 4 cases, TVR in 1 case and simple interrupted sutures in remainders. In c-ECD patients the septal defect was closed with single patch except one case. The atrioventricular valve was repaired with simple interrupted sutures except one MVR and TVR case. The operative mortality was 14.2% in p-ECD, 44.4% in c-ECD, but recent 3 years [1980-1983] mortality was 8.7% in p-ECD, 20% in c-ECD. More than grade III systolic regurgitant murmur was oted postoperatively in 4 cases of c-ECD and 3 cases of p-ECD. The operative risk factors were preoperative NYHA classification, cyanosis, Rp/Rs, systolic pressure of main pulmonary artery and the degree of regurgitation of atrioventricular valves. The causes of death were low cardiac output syndromes, pulmonary complications and arrhythmias.